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Grady Clay Grady Clay is offline
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Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
Jimmy,

There are several BIG issues here.

Yes, the 901 input shaft in 1st gear is a potential weak point. That was particularly true for the ’64-’67 901s that had a smaller diameter threads/nut at the fixed first gear. Even a 2.0 should replace that part.

I have 901/911/914 in two competition cars; a 2.0-2.5 ‘68 911 and a 2576 (91x66) SCCA GT2 914-6. They work great, but are in low torque – high rpm application (the 2676 HP peak is at 7800 and still pulls to 8800.) The 215 mm C6 flywheel and ‘69S Alu clutch is not receptive to standing starts.

For auto-X I recommend a 915. A 3.0 with a 901 and you trying to smoke it off the line is an invitation to disaster.

If you are determined to keep a 901/911/914/904/906/910 transmission, then make it a 4-speed. That puts the 1st gear on the main-shaft. There are ratio choices from “A” thru “GA” and more. You also want a clutch that you can slip under power. That necessitates a 225 mm clutch, a tolerant disc, and your willingness to change it periodically.

Best,
Grady
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Old 02-01-2004, 04:27 PM
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